Quintessence reconstructed: New constraints and tracker viability

Journal Article · Mon Jan 15 00:00:00 EST 2007 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.75.023502· OSTI ID:20935205

Sahlen, Martin; Liddle, Andrew R; Parkinson, David ^[1]

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1. Astronomy Centre, University of Sussex, Brighton BN1 9QH (United Kingdom)

We update and extend our previous work reconstructing the potential of a quintessence field from current observational data. We extend the cosmological data set to include new supernova data, plus information from the cosmic microwave background and from baryon acoustic oscillations. We extend the modeling by considering Pade approximant expansions as well as Taylor series, and by using observations to assess the viability of the tracker hypothesis. We find that parameter constraints have improved by a factor of 2, with a strengthening of the preference of the cosmological constant over evolving quintessence models. Present data show some signs, though inconclusive, of favoring tracker models over nontracker models under our assumptions.

• OSTI ID: 20935205
• Journal Information: Physical Review. D, Particles Fields, Vol. 75, Issue 2; Other Information: DOI: 10.1103/PhysRevD.75.023502; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BARYONS
COSMIC RADIATION
COSMOLOGICAL CONSTANT
COSMOLOGICAL MODELS
COSMOLOGY
NONLUMINOUS MATTER
OSCILLATIONS
PADE APPROXIMATION
RADIOWAVE RADIATION
RELICT RADIATION
SERIES EXPANSION
SUPERNOVAE